r sout isnor source. nes: weecand we did, because anrom e sthis is an area of close-knit indigenous communies, aneconomic and social barrie fothose people make it difficult for them to come here. narrator: heonfirms that a large number of migrants veome from the northern border region and from the metropolitan center, including mexico city. ar regio has, for almost a hundred years, been the west central region, that is, jalisco, michoacan. and we found that indeed, it was still t most important gion forendingignts. narrator: jones then sees a surprising cluster here, whe heecit. s:noceral mexico hascarcely been udd byociascntists. weererore suri s:noceral mexico hascarcely been udd heagni omigrat bfrom the nend a aso is was, weererore suri s:noceral mexico but to verify this, i needed to go into the field.